Debt - Narrative (Details)											1 Months Ended			6 Months Ended		12 Months Ended
	Nov. 09, 2023 USD ($)	Sep. 20, 2023 USD ($)	May 31, 2023 USD ($)	May 12, 2023	Apr. 24, 2023 USD ($)	Mar. 31, 2023 USD ($) cure	Mar. 07, 2023 EUR (€)	Feb. 23, 2023 USD ($)	Dec. 13, 2022 USD ($)	Oct. 20, 2022 USD ($)	Jun. 30, 2023 USD ($)	May 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Oct. 20, 2024 USD ($)	Apr. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Nov. 15, 2023 USD ($)	Nov. 14, 2023 USD ($)
Debt Instrument [Line Items]
Loss on extinguishments of debt																$ 9,000,000	$ 11,000,000	$ 0
Settlement of Energy Services interest rate swap, net of amortization																(19,000,000)	0	$ 0
Restricted net assets																3,600,000,000
Interest rate swaps
Debt Instrument [Line Items]
Fixed rate						3.10%							3.10%
AmeriGas OLP
Debt Instrument [Line Items]
Maximum borrowing capacity																600,000,000	600,000,000
Capital contributions					$ 11,000,000	$ 20,000,000						$ 52,000,000
Mountaineer
Debt Instrument [Line Items]
Maximum borrowing capacity																150,000,000	100,000,000
Energy Services
Debt Instrument [Line Items]
Maximum borrowing capacity																260,000,000	260,000,000
AmeriGas OLP Credit Agreement | AmeriGas OLP
Debt Instrument [Line Items]
Number of equity cure | cure						1
Energy Services Receivables Facility | Energy Services | Receivables Facility | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity														$ 100,000,000	$ 200,000,000
Line of Credit | Mountaineer | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity																20,000,000
Line of Credit | UGI Utilities Credit Agreement | Utilities | Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity									$ 425,000,000
Line of Credit | UGI Utilities Credit Agreement | Utilities | Revolver | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 375,000,000
Increase to limit	$ 125,000,000
Additional automatic extension	5 years
Line of Credit | UGI Utilities Credit Agreement | Utilities | Revolver | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate									0.10%
Line of Credit | UGI Utilities Credit Agreement | Utilities | Bridge Loan | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 38,000,000
Line of Credit | UGI Utilities Credit Agreement | Utilities | Letter of Credit | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 50,000,000
Line of Credit | AmeriGas OLP Credit Agreement | AmeriGas OLP | Revolver | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity																			$ 400,000,000	$ 600,000,000
Line of Credit | AmeriGas OLP Credit Agreement | AmeriGas OLP | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity																$ 100,000,000	$ 100,000,000
Line of Credit | UGI International Credit Facilities Agreement
Debt Instrument [Line Items]
Principal amount		$ 250,000,000
Debt term		5 years
Line of Credit | UGI International Credit Facilities Agreement | Unsecured Debt
Debt Instrument [Line Items]
Principal amount | €							€ 300,000,000
Debt term							5 years
Line of Credit | UGI International Credit Facilities Agreement | Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 300,000,000					€ 500,000,000
Debt term		5 years
Line of Credit | UGI International Credit Facilities Agreement | Revolver | Euro Interbank Offered Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate							3.35%
Line of Credit | UGI International Credit Facilities Agreement | Revolver | Euro Interbank Offered Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate							1.70%
Line of Credit | UGI International Credit Facilities Agreement | Revolver | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate		0.125%		0.10%
Line of Credit | UGI International Credit Facilities Agreement | Bridge Loan
Debt Instrument [Line Items]
Maximum borrowing capacity | €							€ 100,000,000
Line of Credit | UGI International Credit Facilities Agreement | Bridge Loan | Daily Non-cumulative Compounded Reference Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate							3.35%
Line of Credit | UGI International Credit Facilities Agreement | Bridge Loan | Daily Non-cumulative Compounded Reference Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate							1.35%
Line of Credit | UGI Energy Services Credit Agreement | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate				0.10%
Line of Credit | Energy Services Term Loan Credit Agreement | Revolver
Debt Instrument [Line Items]
Increase to limit								$ 125,000,000
Principal amount								800,000,000
Fixed rate						4.53%							4.53%
Quarterly Installments								$ 2,000,000
Settlement of Energy Services interest rate swap, net of amortization													$ 32,000,000
Line of Credit | Energy Services Term Loan Credit Agreement | Revolver | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate								3.25%
Line of Credit | Energy Services Term Loan Credit Agreement | Revolver | SOFR adjustment rate
Debt Instrument [Line Items]
Basis spread on variable rate								0.10%
Line of Credit | Energy Services Term Loan Credit Agreement | Revolver | SOFR base rate
Debt Instrument [Line Items]
Basis spread on variable rate								2.25%
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 150,000,000
Option to increase capacity										$ 250,000,000
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate										1.00%
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | SOFR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate										2.25%
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | SOFR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate										1.00%
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate										0.50%
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | Base Rate Margin | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate										1.25%
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | Base Rate Margin | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate										0.00%
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | One-Month Interest Period (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate										0.10%
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | Three-Month Interest Period (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate										0.15%
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | Six-Month Interest Period (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate										0.25%
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 20,000,000
UGI Utilities Senior Notes: | Senior Notes Due 2028 | AmeriGas Partners And AmeriGas Finance Corp.
Debt Instrument [Line Items]
Principal amount			$ 500,000,000									$ 500,000,000
Interest rate			9.375%									9.375%
UGI Utilities Senior Notes: | Senior Notes Due 2028 | AmeriGas Partners And AmeriGas Finance Corp. | Maximum
Debt Instrument [Line Items]
Call premium			4.688%
UGI Utilities Senior Notes: | Senior Notes Due 2028 | AmeriGas Partners And AmeriGas Finance Corp. | Minimum
Debt Instrument [Line Items]
Call premium			0.00%
UGI Utilities Senior Notes: | AmeriGas Partners Senior Notes | AmeriGas Partners And AmeriGas Finance Corp.
Debt Instrument [Line Items]
Principal amount			$ 675,000,000									$ 675,000,000
Interest rate			5.625%									5.625%
Repayment of debt			$ 150,000,000
Loss on extinguishments of debt											$ 9,000,000